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A. J. MOXHAM ROLLING MILL. No. 303,036. Patented Aug. 5.18.84.

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part of the tongues A, B, and C, the tendency of the metal to flow into said spaces will be fixed and certain. If this bite be varied, the flow of the metal will vary. The parts of the grooves adjacent to the spaces l 2 3 are therefore turned to such curves as will properly and neatly effect or accommodate this iiow into said spaces. The whole pass therefore, or rather each part of each groove constituting the pass, properly grips the bloom, and subsequent turning or twisting in the pass is rendered impossible when once the bloom or bar is fully entered. Care must be taken, however, not to have said spaces too large,or twisting'will be inevitable. In practice it is even preferable to have said spaces of a little less capacity than would be demanded for the tlow naturally imparted to the metal in order to insure positive action on the part of the rolls upon the metal. By the means just described twist is not only prevented, but the desired shape of the mass of metal for the next pass is also effected. It is evident, therefore, that as long as the relation between the tongues and the spaces in pass No. 1 is preserved, as above described, that the proportions of a girder may be varied, and yet be rolled in a pass of proper configuration therefor without departing from-the invention illustrated in said pass No. l.

The grooves in pass No. 2 are dummy grooves. In this pass,it will be observed,that

the protrusion Y (shown in dotted outlines) is thrownnpward to fill out the space D, while the protrusion G X (shown in dotted outlines) is subjected to the ordinary action of a dummygroove to fill out the space E, the work of p* elongation or draft proper being done at the points F and G X. Ordinarily a dummy-pass is only used for purposes of reduction of seetional area simultaneously with the horizontal spreading of some particula'rpoint, as described at G X; but in this case, while said pass effects such action at G X, its action upon the protrusion Y is principally exerted to change the location of the mass protruding at Y, as above stated, rather than to spread said mass by draft exerted thereupon. In pass Np. 3, Fig. 3, there is nothing notable but its shape, (shown in full lines,) to which the metal is reduced from the shape (shown in dotted lines) in which it left pass No. 2. Pass No. 4, Fig. 4, is (like pass No. 2) a dummy-pass, in which the metal is reduced to the desired shape (shown in full lines) from the shape (shown in dotted lines) received in pass No. 3.

There is a twofold advantage gained in rolling in such rolls as are herein described by entering the blooms or bars upon the diagonal, for, in the first place, the diagonal being longer than any one side, the bloom is entered with one of its diagonals vert-ical. Thus the maximum depth of metal is secured (where greatest depth is needed) for first-class girders. If, however, shallow girders only are needed, the excess of depth after leaving the mum of beneiit derived from the original di-l mensions of the bloom or other mass subjected to the rolling operation.

The rolls herein described are adapted to the manufacture of girder tram-rails.

It is obvious that if a forinof girder be desired, either plain or of any shape having a flange unaccompanied by an offset, the necessary changes for such purpose may be made in the grooves or passes without departing from this invention in any substantial particular.

Having thus fully described my said improvements as of my invention, I claim- 1. A set of rolls for rolling blooms or piles Vof rectangular cross-section into girderrails or beams, provided with a pass or grooves, having shaping or forming tongues, as A B C, therein, and spaces, as at l 2 3, the absolute volume of space thus provided for the flow of the metal being only equal to or slightly less 'than the volume of metal displaced under the shaping action of said tongues thereon,where by the bloom or pile, being entered into said pass with one of its diagonal lines vertical and the other horizontal, is supported by all portions of the pass, twisting of the same being thereby prevented and straight delivery of the metal from the pass secured, all substantially as described, for the purposes set forth.

2. A setV of rolls for rolling metal blooms or piles into girder shapes,provided with'a dum my pass or grooves, having spaces, as at E and D, substantially of the contour indicated in Fig. 2, the desired shape of metal in the space E being imparted by elongation, but in the space D mainly by displacement independently of elongation, all substantially as described, for the purposes set-forth.

3. A set of -rolls for rolling metal blooms or piles, provided with two passes substantially ofthe conformation indicated in Figs. l and 2, for the purposes set forth.

4. A set of rolls for rolling meta-l blooms or piles, provided with two passes substantially of the conformation indicated in Figs. 3 and 4, for the purposes set forth.

5. A set of rolls for rolling metal blooms or piles, provided with passes substantially of the conformation indicated in Figs. 1', 2, 3, and 4, for the purposes set forth.

A. J. MOXHAM.

Vitnesses:

A. MONTGOMERY, J. E. SEDLMEYER.

It is easier in all.

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